Shift Register Holding Unit for Stable Gate-Driver Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fluctuations in the output of shift registers in gate driver circuits affect the display effect of high-resolution, narrow-bezel display panels.
Innovation Solution
A shift register design with a holding unit that maintains the potential of a node during specific periods, stabilizing the output by directly writing signals into the node to smooth potential fluctuations, ensuring stable operation and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional shift register design is used in the gate driver circuit, then the circuit can perform basic signal shifting functions, but the output of the shift register fluctuates which affects the display effect
Solution Approach 1:
The shift register is divided into multiple output units (first output unit, second output unit, etc.), each responsible for driving specific pixel rows. Each output unit includes its own control terminal, first terminal, and second terminal, allowing independent control and signal output. This segmentation enables stable operation by isolating fluctuations in one unit from affecting others.
Solution Approach 2:
A holding unit is introduced as an intermediary component between the input units and output units. The holding unit includes a first terminal coupled to the second terminal of the previous output unit and a second terminal coupled to the control terminal of the current output unit. This intermediary structure maintains potential stability during transitions and prevents direct coupling of fluctuations between adjacent output units.
2Speed
If the shift register operates at high speed for narrow-bezel display requirements, then the display response time is improved, but potential fluctuations occur in the output signal
Solution Approach 1:
The holding unit performs preliminary action by maintaining the potential of the second terminal during the transition period when the first output unit is turning off and the second output unit is turning on. This preliminary potential stabilization prevents fluctuations from propagating to subsequent output units, enabling high-speed operation without sacrificing signal stability.
Solution Approach 2:
The holding unit ensures continuous useful action by maintaining the potential of the second terminal throughout the transition period between output units. This continuous potential maintenance eliminates gaps in signal stability during high-speed switching, ensuring uninterrupted stable operation across all output units.
Data Source
AI summary
A shift register, a driver circuit, a display panel, and a display apparatus. In the shift register, a first input unit is configured to write a signal into a first node; a first output unit includes a control terminal coupled to the first node, a first terminal receiving a first voltage signal, and a second terminal coupled to a signal output terminal; a second input unit is configured to write a signal into a second node; a second output unit includes a control terminal coupled to the second node, a first terminal receiving a first clock signal, and a second terminal coupled to the signal output terminal; a holding unit includes an output terminal coupled to the second node, and is configured to maintain a potential of the second node at least during a period when the first output unit is off and the second output unit is on.